121110202009 has 2 divisors, whose sum is σ = 121110202010. Its totient is φ = 121110202008.

The previous prime is 121110201991. The next prime is 121110202091. The reversal of 121110202009 is 900202011121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69696000000 + 51414202009 = 264000^2 + 226747^2 .

It is a cyclic number.

It is not a de Polignac number, because 121110202009 - 2⁵ = 121110201977 is a prime.

It is not a weakly prime, because it can be changed into another prime (121110202099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555101004 + 60555101005.

It is an arithmetic number, because the mean of its divisors is an integer number (60555101005).

Almost surely, 2^121110202009 is an apocalyptic number.

It is an amenable number.

121110202009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121110202009 is an equidigital number, since it uses as much as digits as its factorization.

121110202009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 121110202009 in words is "one hundred twenty-one billion, one hundred ten million, two hundred two thousand, nine".